Ricoh G104 Service Manual page 97

SC
[Level]
Symptom
547 Zero cross error
[D]
1. The zero cross signal is
detected three times
even though the heater
relay is off when turning
on the main power.
2. The zero cross signal is
not detected for three
seconds even though
the heater relay is on
after turning on the
main power or closing
the front door.
3. The detection error
occurs twice or more in
the ten zero cross
signal detections. This
error is defined when
the detected zero cross
signal is less than 17 for
200 ms.
557 Zero cross frequency error
[C]
The detection error occurs
ten times in a row in ten
zero cross signal
detections. This error is
defined when the detected
zero cross signal is more
than 28 for 200 ms.
This SC is only logged. In
this case, the power
frequency is defined as 60
Hz.
670 Engine start-up error
[D]
The ready signal from the
engine board is not
detected.
687 Controller board command error
[D]
A command from the
controller board is not
received.
690 EGB data error
[D]
The data transfer in the
EGB is interrupted by some
incident (e.g. cover open
etc.) during the data
transfer.
SM
CÓPIA NÃO CONTROLADA
Item
Possible Cause/Required Action
• Defective fusing lamp relay
• Defective fusing lamp relay circuit
• Unstable power supply
1. Check the power supply source.
2. Replace the PSU.
• Noise (High frequency)
1. Check the power supply source.
• Defective engine board.
1. Replace the engine board.
• Loose connection
• Defective controller board
• Defective EGB
1. Check the connection of the controller board.
2. Replace the controller board.
3. Replace the EGB
• Defective EGB
1. Replace the EGB.
4-13
CÓPIA NÃO CONTROLADA
SERVICE CALL CONDITIONS
G104